On 6/16/2018 9:34 PM, ED Fochler wrote: >> On 2018, Jun 15, at 9:06 AM, Bowie Bailey <bowie_bai...@buc.com> wrote: >> >> The CPUs were not busy. That's what I was confused about. I would have >> expected to see a bottleneck at some point, but nothing seemed to be >> busy. The CPUs were all at or below 20% and iowait was close to 0 most >> of the time. I'm not sure how I would determine if the loopback was >> saturated. > 20% loaded with 6 or more cores would be a single thread running full speed > on one core. A single task may not stay on one core, it may get moved around > enough that it doesn't appear that any of the cores are heavily loaded. > Doubly true if you have hyperthreading which causes additional CPU shuffling. > > I think you ran into single thread compression performance, plus any of the > normal process, network, and IO latency that would compound with everything > being on one machine. That sounds about right to me. First backups are > slow. SSH probably wouldn't have made any difference at that speed.
No, only 2 cores on this machine. I have another big local backup that's been running all weekend. I am trying sudo/rsync rather than rsyncd or ssh/rsync this time. This directory has millions of small files (and is even bigger than the first one), so I expect it to take longer. This time, I'm seeing higher IO-wait numbers: %Cpu0 : 0.0 us, 1.7 sy, 0.0 ni, 5.7 id, 92.6 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu1 : 0.3 us, 0.7 sy, 0.0 ni, 86.3 id, 12.4 wa, 0.0 hi, 0.3 si, 0.0 st But I don't see high cpu usage. The IO-wait seems to come and go. It alternates with mostly idle periods: %Cpu0 : 3.0 us, 0.7 sy, 0.0 ni, 96.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu1 : 5.0 us, 2.0 sy, 0.0 ni, 92.3 id, 0.7 wa, 0.0 hi, 0.0 si, 0.0 st Neither cpu seems to go higher than 6%. Once this one finishes, I'll have a first round of full backups for all of the large hosts. Hopefully, the backup times will be a bit more reasonable after that. -- Bowie ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
